<div class="error"><p><strong><?php _e( 'Caution:' ); ?></strong> <?php echo _n( 'This theme may be active on other sites in the network.', 'These themes may be active on other sites in the network.', $themes_to_delete ); ?></p></div>

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<p><?php echo _n( 'You are about to remove the following theme:', 'You are about to remove the following themes:', $themes_to_delete ); ?></p>